落叶松硫酸盐浆ECF漂白工艺的研究

Research on Larch Kraft Pulp ECF Bleaching

关键词:  ECF漂白  双氧脱木素  D0EOPD1P漂白  AOX

Key Words:ECF bleaching  two-stage oxygen delignification  D0EOPD1P bleaching  AOX

摘要:对落叶松硫酸盐浆双升流塔氧脱木素（简称双氧脱木素，O1/O2）和D0EOPD1P四段漂白进行了研究，探讨了双氧脱木素O1段NaOH用量，D0段ClO₂用量和P段H₂O₂用量对漂白效果的影响，分析了漂白过程可吸附有机氯化物（AOX）的产生量。结果表明，O1段NaOH用量为2.5%，O2段NaOH用量约0.5%，D0段ClO₂用量为2.5%，EOP段NaOH用量为2.5%，D1段ClO₂用量为0.8%，P段H₂O₂用量为2.0%时，终漂浆的白度达88.4%，黏度为701.9 mL/g，漂白过程中产生的AOX总量为0.88 kg/t浆。

Abstract:The two-stage oxygen delignification (O1/O2) and four-stage D0EOPD1P bleaching of larch kraft pulp were studied, and the effect of the NaOH charge in O1 stage, ClO₂ charge in D0 stage, H₂O₂ charge in P stage on the bleaching efficiency was discussed，the AOX emissions from bleaching were analyzed. Results indicated that when the dosages of NaOH in O1 stage and in O2 stage, ClO₂ in D0 stage, NaOH in EOP stage, ClO₂ in D1 stage, and H₂O₂ in P stage were 2.5%, 0.5%, 2.5%, 2.5%, 0.8% and 2.0% respectively, the brightness of the final bleached pulp was up to 88.4%ISO and pulp viscosity was 701.9 mL/g. The total amount of AOX produced during bleaching was only 0.88 kg/t.